US2658898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs
Assignee: Celanese Corp
•
Filing: 1951-10-19
•
Granted: 1953-11-10
•
Expires: 1971-10-19
Abstract
No abstract record available.
Inventors
- 👤 Jr John R Adams
- 👤 Victor S Salvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:13
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/24; C09B5/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
PROCESS FOR THE PRODUCTION OF DYESTUFF OF THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
11 words
PROCESS FOR THE PRODUCTION OF DYESTUFF OF THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2094463A
Cited
US2124238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |